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Why Aqua regia react with metal doesn't form hydrogen gas?
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Why Aqua regia react with metal doesn't form hydrogen gas?
gold’s reactivity is nearly the lowest of any metal. It falls below hydrogen on the activity series, which means that single replacement reactions like this:
2Au + 6HCl → 2AuCl3 + 3H2
Are non-starters. However, gold will react with aqua regia, a potent mixture of nitric acid and hydrochloric acid. Even then, the reaction doesn’t produce hydrogen gas.
Au + 3HNO3 + 4HCl → [AuCl4]- + 3NO2 + H3O+ + 2H2O
Or
Au + HNO3 + 4HCl → [AuCl4]- + NO + H3O+ + H2O
So if you’re trying to make hydrogen gas, you might opt to use a more reactive (and much less expensive) metal.
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Why Aqua regia react with metal doesn't form hydrogen gas?
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